Static docker image name fails with custom build for other architectures

[al-sabr]

hi there I found a bug in the arangodb starter project
in the runner_docker.go file

func (r *dockerRunner) CreateStartArangodbCommand(index int, masterIP string, masterPort string) string {
	addr := masterIP
	hostPort := 4000 + (portOffsetIncrement * (index - 1))
	if masterPort != "" {
		addr = addr + ":" + masterPort
		masterPortI, _ := strconv.Atoi(masterPort)
		hostPort = masterPortI + (portOffsetIncrement * (index - 1))
	}
	lines := []string{
		fmt.Sprintf("docker volume create arangodb%d &&", index),
		fmt.Sprintf("docker run -it --name=adb%d --rm -p %d:4000 -v arangodb%d:/data -v /var/run/docker.sock:/var/run/docker.sock arangodb/arangodb-starter", index, hostPort, index),
		fmt.Sprintf("--dockerContainer=adb%d --ownAddress=%s --join=%s", index, masterIP, addr),
	}
	return strings.Join(lines, " \\\n    ")
}

the line

fmt.Sprintf("docker run -it --name=adb%d --rm -p %d:4000 -v arangodb%d:/data -v /var/run/docker.sock:/var/run/docker.sock arangodb/arangodb-starter", index, hostPort, index)

should not be static for the docker Image Name arangodb/arangodb-starter

because we are using our own build with our own docker registry for arangodb-starter for arm32 and arm64

This image name should be assignable and dynamic